【正文】 糧庫圈圍式溫度單片機(jī)監(jiān)控裝置設(shè)計目 錄設(shè)計總說明 .................................................................................................................................................IINTRODUCTION............................................................................................................................................II第 1 章 緒論 ...............................................................................................................................................4第 2 章 總體方案設(shè)計 ...............................................................................................................................5 總體方案選擇 ................................................................................................................................5 總體設(shè)計流程 ...............................................................................................................................6 總體設(shè)計方框圖 .................................................................................................................6 電阻頻率溫度轉(zhuǎn)換流程 .................................................................................................6 總體方案性能指標(biāo) .............................................................................................................6第 3 章 硬件設(shè)計 .......................................................................................................................................7 單片機(jī)電路設(shè)計 ...........................................................................................................................7 測溫電路設(shè)計 .............................................................................................................................11 555 時基集成電路 .........................................................................................................12 熱敏電阻串聯(lián)回路 ...........................................................................................................14 多路選擇電路設(shè)計 .....................................................................................................................15 溫度報警電路設(shè)計 .....................................................................................................................17 LM386 元件簡介 ...............................................................................................................18 顯示電路設(shè)計 ..............................................................................................................................19 LED 顯示器結(jié)構(gòu)原理 ........................................................................................................20 LED 顯示器顯示方式 ........................................................................................................21 LED 顯示方式選擇 ............................................................................................................21 串行口通信電路設(shè)計 .................................................................................................................22 串口通訊 ............................................................................................................................22 串口通信接口電路設(shè)計 ....................................................................................................24 排氣扇電路設(shè)計 .........................................................................................................................26 電源電路設(shè)計 .............................................................................................................................26第 4 章 軟件設(shè)計 ...................................................................................................................................28 整體程序的設(shè)計分析 .................................................................................................................28 主程序模塊 .................................................................................................................................28目 錄 溫度查詢、顯示程序模塊 .........................................................................................................33 低溫處理程序模塊 .....................................................................................................................53 高溫處理程序模塊 .....................................................................................................................53 串口通信程序模塊 ......................................................................................................................54 報警程序模塊 .............................................................................................................................55 延時子程序模 塊 .........................................................................................................................57第 5 章 相關(guān)實(shí)驗(yàn) .....................................................................................................................................58結(jié)束語 .......................................................................................................................................................64鳴 謝 .......................................................................................................................................................65參考文獻(xiàn) ...................................................................................................................................................66附錄 1 電路圖 1.....................................................................................................................................67附錄 2 電路圖 2.....................................................................................................................................68附錄 3 元件清單 ....................................................................................................................................69目 錄設(shè)計總說明I設(shè)計總說明糧食產(chǎn)業(yè)是安定天下的產(chǎn)業(yè)，糧食的收購、儲藏是關(guān)系國計民生的大事。水分過高必然引起糧食霉變、生蟲和其它生化變化，致使糧食溫度升高。二是以熱敏電阻作為測溫傳感器，利用頻率、阻值與溫度的關(guān)系，先用公式計算出任意溫度值所對應(yīng)的頻率段，再經(jīng)由所測頻率值查找正確的溫度。本單片機(jī)溫度檢測系統(tǒng)利用熱敏電阻采樣環(huán)境溫度，將熱敏電阻經(jīng)由 555 振蕩電路所發(fā)出的脈沖在單片機(jī)上實(shí)現(xiàn)計數(shù)，然后經(jīng)單片機(jī)簡單處理，轉(zhuǎn)換為七段顯示碼，最終由接口電路輸出，驅(qū)動